Supporting means for rock drills



July 16, 1940. A. FE UCHT SUPPORTING MEANS FOR ROCK DRILLS v Filed July 26, 1938 3 Sheets-Sheet l INVENTOR AL 86787 FEUCHT BY ATTORNEY July 16, 1940. A. FEUCHT SUPPORTING MEANS FOR ROCK DRILLS Filed July 26, 1938 3 Sheets-Sheet 2 INVENTOR 41.8587 FEUCHT' Y A. FEUCHT 2,208,025

SUPPORTING MEANS I OR ROCK DRILLS Filed July 26, 1938 3 Sheets-Sheet 3 INVENTOR ALBE T FLY/CH7 BY Q, ATTORNEY Patented July 16, 1940 PATENT OFFICE 2,208,025 SUPPORTING DIEANS FOR ROCK DRILLS Albert Feucht, Garfield Heights, Ohio, assignor to The Cleveland Rock Drill Company, Cleveland, Ohio, a corporation of Ohio Application July 26, 1938, Serial No. 221,378

7 Claims.

This invention relates broadly to rock drills, but more particularly to a feeding mechanism for rock drills of the stoper type.

One object of this invention is to produce a stoper drill with an improved feeding mechanism acting as a support for the drill.

Another object of this invention is to provide a stoper drill with self supporting means engageable with the work. irrespective of the position of the drill thereon.

Another object of this invention is the production of an improved stoper drill forming a compact assembly, which is strong, durable and effecient.

Other objects and advantages more or less ancillary to the foregoing reside in the specific construction and aggrcupment of the elements peculiar to this structure, as will become apparent from a more complete examination of this specification.

In the drawings:

Fig. l is a side elevational View of a stoper drill embodying the invention and shown partly in section to illustrate details of the construction.

Fig. 2 is an enlarged longitudinal View taken in a plane indicated by line 2-2 in Fig. 1.

Fig. 3 is an enlarged cross sectional view taken in a plane indicated by line 3-3 in Fig. 1.

Fig. 4 is an end elevational View looking in the direction of the arrows 4-4 in Fig. 1.

Figs. 5 to 8 inclusive are enlarged cross sectional views taken in a plane indicated by line 5--5 in Fig. 2 illustrating the throttle valve in different position.

Figs. 9 to 12 are views similar to Figs. 5 to 8 but taken in a plane indicated by line 8--9 in Fig. 2.

Figs. 13 to 16 are views similar to Figs. 5 to 8 but taken in a plane indicated by line l3-l3 in Fig. 2.

Figs. 17 to 20 are also views similar to Figs. 5 to 8 but taken in a plane indicated by line !'l--l l in Fig. 2.

Fig. 21 is a side elevational view of a rock drill embodying the invention shown in operation.

Referring to the drawings in which like symbols designate corresponding parts throughout the several views, I represents the usual fluid actuated drilling motor having a drill steel 26 slidable within the front housing 2! and rotated by the usual rotation mechanism (not shown). Intermediate its ends, the motor is provided with the usual handle 28 extending laterally therefrom and carrying a hand grip 29 rotatable for controlling the rotation of the drill steel 26. To the rear end of the drilling motor 25, there is secured by bolts 30 a back head 3| having a throttle valve 32 rotatable therein by a handle 33 made. integral therewith, and held against axial movement in one direction by a nut 33' and in the other direction by a fluid connection 34 through which motive fluid may be admitted into a central bore 35 formed in the throttle valve 32.

Depending from the front housing 21, there is a relatively large lug 36 having a bore 37 extending therethrough parallelly with the center axis of the drilling motor 25 and formed with a counterbore 38 having seated therein one end of a tubular piston rod 39, which piston rod extends under the drilling motor 25 and has its other end formed with a piston 40. Located within the tubular piston rod 39, there is an inner tube 4| having its left end in Fig. 1, hereinafter referred to as the lower end of the assembly, extending through the piston 48 and closed by an integral cap 42, which cap is formed with an external annular flange 43 engaging a cup shaped packing ring 44 located on the adjacent end wall of the piston 40. The upper end of the inner tube M is externally threaded and extends through the lug 36 to receive a nut 45 engaging the lug 36 forrigidly securing the tubular piston rod 39 and tube 4| to the lug 36 while clamping the packing 44 between the piston 40 and the annular flange 43.

Slidable within the inner tube 4|, there is a piston 46 carrying on each side thereof a cupshaped packing 47 in fluid tight engagement with the tube 41. To the piston 46 is operatively secured by a nut 48 a guide rod 49 extending through the nut 45, which nut carries a packing 58 in fluid tight engagement with the rod 49. The upper end of the rod is preferably pointed V as at 51 for operative engagement with the work as will be'explained later.

Surrounding the tubular piston rod 39, there is a feed cylinder 52 closed at its upper end by a removable bushing 53 affording a sliding bearing for the tubular rod 39, while the lower end of the cylinder 52 is closed by a bottom plate 54 made integral therewith and formed with a point 55. The cap 42 closing the lower end of the inner tube 4! is provided with a shank 56 depending therefrom and carrying thereon a split ring .57 secured against axial movement by a cap screw 58. This split ring is capable of frictional engagement with the inner wall of a bore 59 formed within the point 55 of the plate 54.

Extending longitudinally between the tubular piston rod 39 and the inner tube 4|, there. are

two diametrically opposed passageways 60 and 6 l, the passageway 60 having its upper end opening into a passage 62 formed Within the lug 36, while its lower end opens into the cylinder 52 through a piston port 63. Within the lug 36, the passageway 6| is connected with the exterior of the tubular piston rod 39 by a short port 64, and therefrom to a passage 65 also formed in the lug 36 by a semicircular groove 66, while the lower end of this passageway is opening into the inner tube 4| through a short port 61. Opening into the upper end of the inner tube 4|, there is a passage 66 also located within the lug 36 but in a plane different from that of the passages 62 and 65. From the lug 36, the three passages 62, 65 and 68 extend longitudinal within the side wall of the drilling motor 25 to end at the throttle valve 32, where they are located in three different planes as clearly shown in Fig. 2.

Adjacent the passage 68, the throttle valve 32 is formed with an inlet port 69 and a semicircular exhaust groove 10 in communication with an exhaust port 1| formed within the back head 3|. Adjacent the passage 62, the throttle valve 32 is provided with an inlet port 12 capable of communication with the passage 62 via a vshaped groove 73 formed on the valve, While the port 12 is also capable of communication with the exhaust port H through a semicircular exhaust groove M which communicates with the exhaust groove 10 through a longitudinally disposed slot l5. Aifording communication of the exhaust groove 14 with the third passageway 65, there is a second longitudinally disposed slot 16, while the passageway 65 is capable of communication with a semicircular V-shaped groove 17 having an inlet port 18 opening therein. Toward the motive fluid connection 34, the throttle valve 32 is provided with a fourth inlet port 19 capable of communication with a passage 86 formed in the back head 3| for admitting motive fluid into the drilling motor 25. Adjacent the bushing 53, the feed cylinder 52 is also provided with an exhaust port 8|, the purpose of which'will be explained later.

Depending from the back head 3| and made integral therewith, there is a large ring 82 slidable over the feed cylinder 52 for guiding the drilling motor 25 against lateral movement relative thereto.

In the operation of the mechanism, let it be assumed that motive fluid is admitted through the motive fluid connection 34 into the throttle valve bore 35, and that the throttle valve is positioned as shown in Figs. 6, 10, 14 and 18. In this instance motive fluid from the throttle valve bore 35 will be slowly admitted into the passage 65 via the inlet port T8 and groove T! (Fig. 14), and from the passage 65 into the lower end of the inner tube 4| via the groove 66, the port 64 (Fig. 3) the passageway 6| and the port 61. In the inner tube il, the motive fluid acting on the piston 36 will cause the telescopic movement of the rod 49 into engagement with one wall of the work as shown in Fig. 21, while the pointed end 55 of the cylinder 52 engages the ground or another wall of the work. The cylinder 52 and the guiderod 49, hereinafter referred to as the telescopic support, may thus be jammed between walls of the work for carrying the drilling motor slidable thereon. During the expansion of the telescopic support, it will be noticed that the inner cylinder ll between the piston 46 and the lug 36, is exhausted via the pasasge 68, the exhaust groove l6 and the exhaust port 69 (Fig.

6), while the inlet port 19 is out of communication with the passage (Fig. 18) toprevent operation of the drilling motor, and the feed cylinder 52 is in communication with the atmosphere via the exhaust groove M (Fig. .10), which groove communicates with the exhaust port 69 through the slot 15.

When it is desired to feed the drilling motor to the work, the throttle valve 32 may be positioned as shown in Figs. '7, l1, l5 and 19. In this position of the throttle valve, the groove '13, having motive fluid supplied thereto from the throttle valve bore 35 through the port 7.2, is in part communication with the passage 62 (Fig. 11) for slowly admitting motive fluid into the passageway 66 and therefrom into the lower end of the feed cylinder 52 via the port 63. In the feed cylinder 52, the motive fluid will act on the piston 46 to gradually drive the piston rod 39 and the inner tube 4| out of the cylinder 52, thereby imparting feeding motion to the drilling motor 25 relative to the feed cylinder 52. During this feeding motion of the drilling motor, the throttle valve inlet port 78 is still in communication with the passage 65 via the groove ll (Fig. 15), thereby admitting motive fluid into the inner tube 4| for maintaining the guide rod 9 and consequently the support in operative engagement with the work. As the bottom end 52 of the inner cylinder 2| moves toward the piston 46, the motive fluid within the lower end of the inner tube 4| will be subjected to a gradually increasing pressure, which, when greater than that of the motive fluid supplied to the throttle valve 32, will remain constant by forcing motive fluid to back out of the inner tube ll through the port 6? and the passageway 6|, thereby subjecting the piston 46 and consequently the guide rod 49 to a greater pressure than that actuating the feeding mechanism. As the drilling motor is slowly fed to the work, the inner tube 4| between the piston 66 and the lug 36 is still exhausted through the passage 68, the throttle valve groove iii and the exhaust port ll (Fig. '7), while the throttle valve port 19 is still out of communication with the port 80 (Fig. 19) for preventing operation of the drilling motor 25.

After the drilling motor has been fed to cause contact of the drill steel 26 with the work, the throttle valve 32 may be positioned as shown in Figs. 8, l2, l6 and 20. In this instance, the throttle valve port 79 is in communication with the port 80 (Fig. 20) for supplying motive fluid to the drilling motor and causing its operation. Simultaneously motive fluid is still admitted to the piston of the guide rod 49 via the port T8, the groove 1! and the passage 65 (Fig. 16), while the feed piston 46 is also supplied with motive fluid via the port l2, the groove l3 and the passage 62 (Fig. 12), which passage above explained leads into the lower end of the feed cylinder 52 via the passageway 60 and the port 63, thereby causing,'during operation of the drilling motor 25, the telescopic support to remain in operative engagement with the work while the drilling motor is fed to the work as the drilling operation proceeds. During this drilling operation, the inner tube between the piston 46 and the lug 36 is still exhausted via the passage 68, the groove "in and the exhaust port ll (Fig. 8), while air within the feed cylinder 52 between the piston 46 and the bushing 53 is free to exhaust through the vent 8|.

After the drilling operation, when it is desired to collapse the assembly into the position shown in Fig. 1, the throttle valve 32 may be positioned as shown in Figs. 5, 9, l3 and 17. In this instance, the motive fluid previously admitted into the feed cylinder 52 is free to exhaust therefrom via the port 53, the passageway Gd, the passage 62 and the slot l (Fig. 9), which slot is in communication with the exhaust port H, thereby enabling the drilling motor 25 together with the tubular piston rod 39 and the inner tube All to drop into the position shown in Fig. 1. Simultaneously, the motive fluid previously admitted into the lower end of the inner tube at is free to exhaust therefrom via the port 6?, the passageway 65, the port 6 and groove 86 (Fig; 3), the passage 65 and the slot it; (Big. 13), which slot is in communication with the exhaust port H. In this instance, to cause retraction of the telescopic frame, motive fluid is admitted into the inner tube 3E between the piston it and the lug 3i; via the throttle valve inlet port 89 and the passage GB (Fig. 5), thereby causing motive fluid to act on the upper side of the piston 23 for driving it together with the guide bar d9 into the position shown in Fig. 1. In this last position of the throttle valve, it will be noticed that the throttle valve inlet port 16 is out of communica tion with the port 88, thereby preventing operation of the drilling motor 25.

Due to the connections between the drilling motor 25 and its feeding mechanism, which connections include the lug 62 and the ring 82, it will be understood that the drilling motor is capable of revolving around the cylinder 52,

thereby enabling the operator holding the hand grip 29 of the handle 28 to move the drilling motor around the feed cylinder into the desired drilling position. Once the drill steel has penetrated the rock or work sufliciently to prevent accidental jumping of the drill steel out of the drill hole, the operator may remove his hand from the handle 25, in which instance rotation of the drilling motor 25 around the feed cylinder 52 is prevented by the drill steel 26.

When the assembly is in the retracted position shown in Fig. 1, the drilling motor 25 may be lifted and moved about with the feed cylinder 52 locked against slidable movement relative thereto due to the frictional engagement of the split ring 57 with the inner wall of the bore 59.

Although the foregoing description is necessarily of a detailed character, in order to completely set forth the invention, it is to be understood that the specific terminology is not intended to be restrictive or confining and it is to be further understood that various rearrangements of parts and modifications of structural detail may be resorted to without departing from the scope or spirit of the invention as herein claimed.

I claim: 1. In an apparatus of the class described, a

drill support including fluid actuated telescoping elements movable into operative engagement with walls of the work, a drilling motor slidable on said support, and fluid actuated means within said support connected to said motor for imparting slidable movement thereto.

2. In an apparatus of the class described, a drill support including a cylinder, a fluid actuated rod slidable therein extending through one end thereof, said cylinder and rod being engageable with walls of the work for axially jamming said support therebetween, a drilling motor slidable on said support, and fluid actuated means within said cylinder connected to said motor for transmitting feeding motion thereto.

3. In an apparatus of the class described, a fluid actuated telescopic support adapted to be axially jammed between walls of the work, a drilling motor carried by said support slidable relative thereto, and fluid actuated feeding means within said support including a piston connected to said motor for imparting feeding motion having its opposite ends engageable with walls one direction prior to the operation of said feed:

ing mechanism.

6. In a rock drilling apparatus, a support including a pair of fluid actuated telescoping elements, a drilling motor slidable relative to said support, and a fluid actuated feed member slidable between said elements and connected to said motor.

7. In an apparatus of the class described, a drill support including two telescopically mounted elements movable into operative engagement with walls of the work, a drilling motor slidable on said support, and fluid actuated feeding means for said motor including a tubular member connected to the motor and slidable between said elements.

ALBERT FEUCHT. 

